Julian o



(No Model.)

JVO. ELLINGER.

. MANUFACTURE OF SEGONDARY BATTERY PLATES.

No. 388,960. Patented Sept. 4, 1-888.

N Perms. MW

lJNrTED STATES JULIAN o. ELLINGER,

PATENT @rrrcn.

OF NEXV YORK, N. Y.

MANUFACTURE OF SECONDARY-BATTERY PLATES.

EEPECIFICATION forming part of Letters Patent No. 388,960. flared Septe. river 4, 1888.

Appiication filed April 30, 18M.

To all whom it may concern.-

Be it known that I, JULIAN O. ELLINGER, of the city of New York, in the county and State of New York, have invented a certain new and useful Improvement in the Mann facture-of SecondaryBattery Plates, of which the following is a specification.

The object of my invention is to provide secendarybattery plates of an efficient character and by a simple and convenient process, including the application of pressure,to consolidate the metal of the plates and increase the efficiency thereof, as set forth in my application filedA pril 23,1S87,Serial No. 235, 919.

The plates produced by my method are of the form which has been found best in practice-namely, a plate of lead or an alloy of lead and other metal, provided with apertures extending through it, such apertures having opposite bevels,so as to have a greater width at one point than at another, whereby the active material. placed in such apertures is held from falling out.

The present invention consists, mainly, in stamping out by cutting and pressing from a sheet of metal two similar plates, each having beveled apertures, and attaching such plates togethenso that a single plate with opposite] y beveled apertures is formed.

The pressing of the plate is a feature of great advantage in the manufacture of secondary-battery plates, since it consolidates the metal and makes it more homegeneous, eliminates any air-holes, and makes aplate of even density and conductivity,the conductivity and electrical capacity being increased withoutincrease in the weight and with a decrease in bulk for the same weight. The plate is also made harder and stronger by pressing and the spaces between the holes may be made very narrow. By my invention, therefore, I not only provide a simple and cheap process of making the plates, but I also improve the construction and increase the efficiency and usefulness of such plates.

My invention is illustrated in the acconipanying drawings.

Figure l is a view in elevation of a plate made according to my invention in the prefer-red form; Fig. 2, an enlarged cross-section of a part of said plate; Fig. 3, a section of the Serial No. 236,625. (No model.)

double plate with its parts united so that the bcvels are in the opposite direction from those of Figs. 1 and 2; Fig. 4, a section of the die plates used for cutting and pressing the halfplate at one operation; Fig. 5, a section of dieplatcs used forcutting the apertures only, and Fig. 6 a section of die-plates used to press the apertures into form.

The completed plate in its preferred. form consists of two rectangular half-plates, A and A, each formed with beveled edges a and with beveled apertures b, the plates being united together at their edges, as shown in Fig. 2, so that a plate is formed with apertures having opposite bevels and narrowest at their middle part. The plates are preferably united by fusion; out they may be bolted or riveted or otherwise secured together. The plates may, however, be put together in the opposite way, as in Fig. 3, so that the apertures are Widest at the middle and narrower at the surfaces of the complete plate. It will be understood that in either form the irregularityin shape of the aperture prevents the active material from falling out on either side.

In forming the plates I may use the dieplates B B shown in Fig. 4. The upper dieplate 13 has parallel rows of beveled projections d, each having a recess tapering at its inner end. The lower die-plate B has square projections e and recesses f between them. The die-plate B preferably has cutting-edges at g.

A sheet of metal of proper thickness to form one of the half-platesthe two half-plates being exactly a1ikeis placed between these dieplates, and they are brought together upon it by means of a suitable press or otherwise, whereby the projections of the upper plate enter the recesses f of the lower plate, and the cutting-edges of said projections cut out por tions of the metahwhich fall through said recesses. At the same time the remaining metal parts of the plate are forced by the projections 6 up into the tapered ends of the recesses of the upper plate, whereby such metal portions are pressed into the desired beveled form, the metal is consolidated, and the metal between the holes is brought to the narrowest possible edges. At the same time the outting-edges at 9 cut out the plate from the metal sheet. The

die-plates may also be formed so as to cut the tongue h for making connection to the plate. The half-plates may also be formed by first cutting and then pressing, as illustrated in Figs. 5 and 6. The lower die-plate G of Fig. 5 is like the lower one of Fig. 4, and also the upper plate 0 is the same as the upper plate of Fig. 4., except that the inner ends of its recesses are square instead of tapering. The euttingedges of the upper dies pass through the sheet of metal and cut square apertures therein. The sheet thus perforated is then placed between the pressing die-plates D D! Fig. 6, the lower one having square projections and the upper one recesses with beveled ortapering inner ends. On these dies being brought together upon the perforated metal the metal between the perforations is forced into the recesses in the upper die and pressed and consolidated into the beveled form shown. Two of these beveled plates are, as already stated, placed together, as in Fig. 2 or Fig. 3,

and joined together at their edges, forming a complete plate of compact and consolidated metal and with the metal brought to such narrow edges between the apertures that when the apertures are filled with the active material the plate has practically no inactive metal surface.

\Vhat I claim is- 1. The method of making a secondary-battery plate, consisting in forming two halfplates by pressing the metal into the desired form and then securing them together, substantially as set forth.

2. The method'of making a perforated secondary-battery plate, consisting in forming two perforated half-plates by cutting and pressing and then securingthem together, substantially as set forth.

3. The method of making a perforated secondary-battery plate by stamping two halfplates with beveled apertures, and then securing said plates together, substantially as set forth.

4. The method of making a perforated secondary-battery plate, consisting in forming two half-plates by first cutting apertures in metal sheets and then pressing such apertures into the desired form and securing said halfplates together, substantially asset forth.

This specification signed and; witnessed this 28th day of April, 1887.

JULIAN O. ELLINGER. 

